Main.java

import org.graalvm.polyglot.*;
import org.graalvm.polyglot.Context.Builder;
import org.graalvm.polyglot.proxy.*;
import java.util.*;
public class Main {
    public static void main(String[] args) {
        try (Context context = Context.newBuilder()
                                      .allowAllAccess(true)
                                      .build()) {
            
            Map<String, Object> javaMap = new HashMap<>();
            javaMap.put("name", "GraalVM");
            javaMap.put("version", 21.1);
            context.getBindings("js").putMember("javaMap", javaMap);
        
            Value jsObject = context.eval("js", 
                               "{ " + 
                               "print(javaMap.name);" + 
                               "print(javaMap.version);" + 
                               
                               " new Map([['hello','world'],[1, 42]]);"+ 
                               "}");
            var map = jsObject.as(Map.class); 
            System.out.println(map + "; " + map.get("hello"));
        }
    }
}